FAN7547A LCD Backlight Inverter Drive IC

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Lawrence McLaughlin
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FAN7547A LCD Backlight Inverter Drive IC Features Backlight Lamp Ballast and Soft Dimming Reduced Number of Components Wide Range of Operating Voltage (6 to 30V) Precision Voltage Reference Reduced

1 FAN7547A LCD Backlight Inverter Drive IC Features Backlight Lamp Ballast and Soft Dimming Reduced Number of Components Wide Range of Operating Voltage (6 to 30V) Precision Voltage Reference Reduced to 3.4% Low Standby Current (Typically 50µA) Soft-Start Function PWM Control Analog, Mixed, and PWM Dimming Function P-Channel MOSFET Drive Open-Lamp Protections (OLP) Shutdown Protections (SDP) 14-Pin SOP Description February 2007 The FAN7547A provides all control functions for a current-fed, push-pull, self-oscillation type converter and also contains a pulse-width-modulated (PWM) controller to develop a supply voltage. Typical operating frequency range is from 30kHz to 100kHz, depending on the cold cathode fluorescent lamp (CCFL) and the transformer's characteristics. 14-SOP Ordering Information Part Number Package Pb-Free Operating Temperature Range Packing Method FAN7547AM FAN7547AMX 14-SOP Yes -25 C ~ +85 C Tube Tape & Reel FAN7547A Rev

2 Internal Block Diagram OUT V CC SW V Z UVLO 5V S/S 1.3V 0.1V RCT Oscillator 3V Internal Bias Comparator3 120μA Output Driver Q R S V CC 40μA Comparator2 7V Comparator1 Buffer Amplifier V Z 2μA 3.7V V CC 1 SDP OSC COMP FB OLP Comparator4 V b V a Comparator5 Dimming Control and Mode Selection Block 50kΩ V DS Analog PWM Mixed 2V Comparator6 50kΩ V ms Full Lighting when V DS = 3V 1V GND FAN7547A Rev Figure 1. Functional Block Diagram of FAN7547A FAN7547A Rev

3 Pin Configuration OUT V CC 1 V CC OSC S/S COMP FB FAN7545A GND V DS V ms RCT OLP SDP Figure 2. Pin Configuration (Top View) FAN7547A Rev Pin Definitions Pin # Name I/O Description 1 GND Ground 2 V DS I Dimming Voltage Input 3 O Reference Voltage 4 V ms I Dimming Mode Selection 5 RCT Burst Dimming Frequency Set 6 OLP I Open-Lamp Protection 7 SDP I Shutdown Protection 8 FB I Feedback Input 9 COMP Error Amplifier Output 10 S/S Soft-Start 11 OSC I Main Ct 12 V CC I Supply Voltage 13 V CC 1 I Output Drive Source Voltage 14 OUT O Output Drive FAN7547A Rev

4 Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. -25 C T A 85 C and V CC =10V unless otherwise specified. Symbol Parameter Value Unit V CC Supply Voltage 6 to 30 V T J Operating Junction Temperature 150 C T A Operating Temperature Range -25 to 85 C T STG Storage Temperature Range -65 to 150 C P D Power Dissipation 0.5 W FAN7547A Rev

5 Electrical Characteristics Unless otherwise noted, these specifications apply to the operating ambient temperatures for the FAN7547A with -25 C T A 85 C and V CC = 10V. Symbol Parameter Conditions Min. Typ. Max. Unit UVLO SECTION V ST Start Voltage V I ST Start Current V CC = 4.5V μa I CC Operating Current 7V < V CC < 30V ma REFERENCE SECTION Reference Voltage T J = 25 C, I ref = 0mA, 7V < V CC < 30V V SOFT-START SECTION I SS Soft -Start Charge Current C SS = 4V μa I pwm PWM Discharge Current C SS = 4V μa OSCILLATOR SECTION f pwm Operating Frequency 7V < V CC < 30V Hz V pwmh Osc High Voltage 1.3 V V pwmi Osc Low Voltage 0.1 V DIMMING SECTION V a 0 3 V Analog Dimming Range V ms > 2V V b 3 V V a V PWM Dimming Range V ms < 1V V b V V a V Mixed Dimming Range V ms =1.5V or open V b 0 3 V MODE SELECTION V sa Analog Dimming Select Voltage V V sp PWM Dimming Select Voltage V V sc Mixed Dimming Select Voltage V OPEN-LAMP PROTECTION V open Open-Lamp Detect Voltage 7V < V CC < 30V V SHUTDOWN PROTECTION I sd Shutdown Current 7V < V CC < 30V μa V sd Shutdown Voltage V OUTPUT SECTION V OH Output High Voltage V CC = 10V V V OL Output Low Voltage V CC = 10V 1 V t r Rising Time V CC = 10V ns t f Falling Time V CC = 10V ns V UV Output Voltage with UVLO Activated V CC = 4V 2 4 V FAN7547A Rev

6 Typical Characteristics I ICC CC [ma] VCC CC [V] Figure 3. Start Voltage Start Voltage Voltage[V] [V] Start Voltage vs Temparature Figure 4. Start Voltage vs. Temperature 120 Start Current vs Temparature 3.15 Reference Voltage vs Temparature Start Current[uA] [μa] Reference Voltage[V] [V] Figure 5. Output vs. Temperature Figure 6. Reference Voltage vs. Temperature Soft Start Charge Current vs Temparature Operating Frequency vs Temparature 230 Soft-Start Start Charge Current[uA] Current [μa] Operating Operating Frequency[Hz] Frequency [Hz] Figure 7. Soft-Start Charge Current vs. Temperature Figure 8. Operating Frequency vs. Temperature FAN7547A Rev

7 Typical Characteristics (Continued) Shutdown ShutDown Current Current[uA] [μa] ShutDown Current vs Temparature Temparature['C] Temperature [ C] Figure 9. Protection Current vs. Temperature Shutdown ShutDown Voltage[V] [V] ShutDown Voltage vs Temparature Temparature['C] Temperature [ C] Figure 10. Protection Voltage vs. Temperature Output High Voltage vs Temparature Output Low Voltage vs Temparature Output Output High Voltage[V] [V] Output Low Voltage[V] [V] Figure 11. Output High Voltage vs. Temperature Figure 12. Output Low Voltage vs. Temperature Output Voltage with UVLO UVLO Activated[V] Activated [V] Output Voltage with UVLO Activated vs Temparature Temparature['C] Temperature [ C] Figure 13. Output Voltage with UVLO Activated vs. Temperature FAN7547A Rev

8 Package Dimensions 14-SOP Dimensions are in millimeters unless otherwise noted. Figure Lead Small Outline Package (SOP) FAN7547A Rev

9 TRADEMARKS The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. ACEx Across the board. Around the world. ActiveArray Bottomless Build it Now CoolFET CROSSVOLT CTL Current Transfer Logic DOME E 2 CMOS EcoSPARK EnSigna FACT Quiet Series FACT FAST FASTr FPS FRFET GlobalOptoisolator GTO HiSeC i-lo ImpliedDisconnect IntelliMAX ISOPLANAR MICROCOUPLER MicroPak MICROWIRE MSX MSXPro OCX OCXPro OPTOLOGIC OPTOPLANAR PACMAN POP Power220 Power247 PowerEdge PowerSaver PowerTrench Programmable Active Droop QFET QS QT Optoelectronics Quiet Series RapidConfigure RapidConnect ScalarPump SMART START SPM SuperFET SuperSOT -3 SuperSOT -6 SuperSOT -8 TCM The Power Franchise TinyBoost TinyBuck TinyLogic TINYOPTO TinyPower TinyWire TruTranslation μserdes UHC UniFET VCX Wire DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS. LIFE SUPPORT POLICY FAIRCHILD S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Product Status Definition Advance Information Formative or In Design This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. Preliminary First Production This datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. Obsolete Not In Production This datasheet contains specifications on a product that has been discontinued by Fairchild Semiconductor. The datasheet is printed for reference information only. Rev. I Fairchild Semiconductor Corporation

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